this is often called a 7 minute frosting, or cooked frosting or american meringue - I call it marshmallow frosting, it has the flavor and texture that is that of a soft spreadable marshmallow. Perfect in place of meringue on tarts, or as a frosting on cupcakes or cakes, amazing plain or toasted and any extra is perfect with graham crackers
Keyword american meringue, marshmallow fluff, marshmallow frosting, seven minute frosting
Put eggs whites, sugar and corn syrup in the top of a double boiler over boiling water and beat with a hand mixer until it turns white, thickens and ribbons form- about 4 mins.
Transfer mixture to a room temp mixing bowl,(or place warm bowl into a bowl if ice to cool it down) add vanilla and beat with electric mixer with whisk attachment on Med high until stiff peaks form- about 3 mins.